GB2124272A

GB2124272A - Shock protected buildings

Info

Publication number: GB2124272A
Application number: GB08319756A
Authority: GB
Inventors: Klaus-Dieter Borsetzky; Hans-Joachim Hilpert
Original assignee: Deutsche Gesellschaft fuer Wiederaufarbeitung von Kernbrennstoffen mbH
Current assignee: Deutsche Gesellschaft fuer Wiederaufarbeitung von Kernbrennstoffen mbH
Priority date: 1982-07-26
Filing date: 1983-07-22
Publication date: 1984-02-15
Also published as: BE897235A; FR2530714A1; DE3227883A1; BR8303947A; GB8319756D0; JPS5934378A

Abstract

For protecting buildings (especially buildings for reconditioning nuclear fuels), against dynamic stresses the buildings have an outer structure 6 that encloses an inner structure 4 with a clearance and with elastic members and damplng members 24 located between the inner and outer structures. The elastic and damping members are located between the base plate 16 of the outer structure and the base plate 10 of the inner structure. The elastic and damping characteristics of the elastic and damping members may be selected such that no forces that actuate the fundamental frequency of the inner structure and the fundamental frequencies of the components and systems are transferable to the inner structure and its components and systems. <IMAGE>

Description

SPECIFICATION Means for protecting buildings The invention is concerned with means for protecting buildings, especially elongated buildings and especially buildings for reconditioning installations and their components and systems.

DE-PS 624 955 shows a device for protecting buildings against shocks that uses insulation elements that are inserted in a dividing line running horizontally between a lower and an upper part of the building. The insulation elements have a housing consisting of parts that can be telescoped together and between which elastic, interchangeable insertions, for example, in the form of springs or plates made of cork or rubber, are located. This known device does indeed offer a certain amount of protection against the effects of earthquakes, but it does not do so in the case of airplane crashes and other forces putting a strain of the upper part of the building.

DE-PS 28 35 877 shows a device for protecting a nuclear power plant against shock effects in which an elastically deformable connection exists between the support structure of the containment vessel of the nucelar power plant and its base. The support structure projects into the interior of a basin-shaped base. Shockdamping elements in the form of shock dampers and flexible hoses filled with liquid to provide a floating support for the containment vessel are located between the base and the support structure. Furthermore, the containment vessel is surrounded by a protective cover to protect against shock stresses. This known device can only function inadequately in damping resonant vibrations and accelerative forces.

Only inadequate protection is provided for devices, pieces of apparatus and machines inside the building.

The present invention seeks to develop a device for protecting buildings, especially elongated buildings, especially buildings for reconditioning installations and their components and systems in such a way that overloading of the inner structure and its components and systems by accelerations as a result of influences from outside are prevented. Furthermore, the device should be as simple as possible and the cost of producing it should be as low as possible.

According to this invention, we provide means for protecting buildings, especially elongated buildings and especially buildings for reconditioning installations and their components and systems, against dynamic stresses resulting from outside influences, which buildings have an outer structure that encloses an inner structure with a clearance with damping elements located between the inner and outer structures, comprising elastic members and damping members on which the inner structure rests located between a base plate of the outer structure and a base plate of the inner structure.

In the construction of the invention the inner structure is supported in the outer structure in such a way that influences from outside are effectively absorbed and damped. Overloading of the inner structure and its components and systems can no longer occur as a result of external accelerations. Further in accordance with the invention the protection of buildings, for example for reconditioning installations, can be done at an acceptable cost.

Preferably, the characteristics of the elastic and damping members are selected or can be adjusted such that no forces are transferable to the inner structure and to components and systems inside the inner structure on various levels which forces would excite unacceptable, excessive vibrations compatible with the fundamental frequences of the inner structure and the components and systems. By means of this further development, those effective influences on the inner structure from outside are prevented that could give rise to a danger that the inner structure and its components and systems would be agitated with unacceptably large vibrations.

According to a preferred feature of the invention the outer structure is located in a foundation tank.

Furthermore, preferably the elastic damping members are fastened to individual, blocklike elevations that are separated from each other, or to rows of elevations of the base plate of the outer structure that are separated from each other and run longitudinally or transversely.

In this case, preferably the distances between the blocks or rows of elevations and the distance between the base plates are selected such that, for the purpose of inspecting and servicing the elastic and damping members, passages of sufficient width and height are formed in which machines are able to work for replacing individual elastic and damping members. Two rows of elastic and damping members may be located on an elevation.

By means of these advantageous further developments, the servicing and inspecting of the support provided by elastic and damping members in accordance with the invention is made considerably easier. It is easy to carry out any necessary replacement of individual elastic and damping members by means of suitable machines, such as fork-lift trucks, which can be worked in the passages between the elastic and damping members.

According to a further preferred feature, a distance is left between the walls and/or roofs of the inner structure and the outer structure that at least corresponds to the maximum deformability of the wall and/or roof of the outer structure by an outside influence, by this means one makes such that forces that bring about a deformation of the wall or the roof of the outer structure cannot be transferred to the inner structure and its components and systems.

The invention will now be explained in greater detail by way of example with reference to the drawings, in which an embodiment of the invention is represented Figure 1 shows a section through a building for reconditioning installations constructed in accordance with the invention.

Figure 2 shows a plan view of the elastic members constructed and installed in accordance wi.h the invention.

Figure 3 shows a section through a part of the building with elastic members installed.

In the drawings, similar structural parts are given the same reference numbers.

The drawings show a building 2 consisting of an inner structure 4 and an outer structure 6 separated from and enclosing the inner structure 4. The lower part of the building 2 is located in a base tank (8).

The inner structure 4 has a base plate 10, walls 12 and a roof 14 and the outer structure 6 has a base plate 16, walls 18 and a roof 20. In the inner structure 4, various components and systems 22 are located on the various levels that are provided for the reconditioning of nuclear fuels.

The inner structure 4 is supported by means of elastic and damping members 24 in the outer structure 6. The elastic and damping members 24 are only located between the two base plates 10 and 16. which are separated from each other. In regard to their absorbent and damping characteristics, they are adjusted, or are capable of being adjusted, in such a way that vibrations of a rather high frequency (approximately 40 Hz)caused by airplane crashes, for example-that are absorbed by them and low-frequency vibrations (approximately 2 to 10 Hz)-caused by earthquakes, for example-in which several shocks one after another can occur that have the characteristic frequency of the inner structure and the components and systems, which might set the inner structure 4 and the components and systems 22 to vibrating at their natural frequency, are absorbed and damped in such a way that those natural frequencies cannot be set going.

The arrangement and construction of the elastic and damping members 24 and of the ground plate 1 6 is shown more precisely in Figures 2 and 3. The elastic and damping members 24 are supported by spring collars 26 on the base plate 10 of the inner structure 4, on the one hand, and by spring collars 28 on blocklike elevations that are separated from each other or on rows of elevations 30 of the base plate 1 6 of the outer structure 6 that are separated from each other and run longitudinally and/or transversely, on the other.

Passages 32 are left between the elevations whose width and inside height between the floor 34 of the passage and the base plate 10 are such that machines, such as fork-lift trucks, for example, for replacing individual elastic and damping members are able to work in the passages. The passages can have a width of 7 meters and an inside height of 2.50 meters, for example. The height of the elevations can be 1.50 meters, for example and the height of the elastic and damping members can be 1 meter. Providing the passages between the elevations makes inspecting and servicing the elastic and damping members considerably easier.

It is preferable for not more than two rows of elastic and damping members to be located on each of the elevations 30, so that all elastic and damping members will be easily accessible.

The elastic and damping members 24 consist of an elastic member 36 and a damping member 38. In the embodiment that is shown, the damping member 38 is mounted in the elastic member 36. The damping members and the elastic members can also be set up separately.

Appropriately dimensioned spiral springs are preferred for use as elastic members and socalled viscodampers are preferred for use as damping members. The integrated elastic and damping members or the elastic and damping members that are installed separately are fastened to the base plate 10 and 1 6 with screws (not shown). The elastic member-damping member arrangement is effective for both vertical and horizontal acceleration forces.

Claims

1. Means for protecting buildings, especially elongated buildings and especially buildings for reconditioning installations and their components and systems, against dynamic stresses resulting from outside influences, which buildings have an outer structure that encloses an inner structure with a clearance with damping elements located between the inner and outer structures, comprising elastic members and damping members on which the inner structure rests located between a base plate of the outer structure and a base plate of the inner structure.

2. Means for protecting buildings as claimed in claim 1, wherein the characteristics of the elastic and damping members are selected or can be adjusted such that no forces are transferable to the inner structure and to components and systems inside the inner structure on various levels which forces would excite unacceptable, excessive vibrations compatible with the fundamental frequencies of the inner structure and the components and systems.

3. Means for protecting buildings as claimed in claim 1 or 2, wherein the outer structure is located in a foundation tank.

4. Means for protecting buildings as claimed in claim 1, 2 or 3 wherein the elastic and damping members are fastened to individual, blocklike elevations that are separated from each other, or to rows of elevations of the base plate of the outer structure that are separated from each other and run longitudinally or transversely.

5. Means for protecting buildings as claimed in claim 4, wherein the distances between the blocks or rows of elevations and the distance between the base plates are selected such that, for the purpose of inspecting and servicing the elastic and damping members, passages of sufficient width and height are formed in which machines are able to work for replacing individual elastic and damping members.

6. Means for protecting buildings as claimed in claim 4 or 5, wherein two rows of elastic and damping members are located on an elevation.

7. Means for protecting buildings as claimed in any one of the preceding claims, wherein a distance is left between the walls and/or roofs of the inner structure and the outer structure that at least corresponds to the maximum deformability of the wall and/or the roof of the outer structure by an outside influence.

8. A building having protection means according to any one of the preceding claims.

9. Means for protecting buildings, substantially as shown in the accompanying drawings and described herein with reference thereto.